Blow-off for boilers.



G. PURVIS.

BLOW-OFF FOR BOILERS.

APPLICATION IILEI) AUG.6,1913.

1,098,836, Patented June 2, 191i 3 SHEETS-SHEET 1.

George Pa r0315, l/v'i/limeoozo Q WH COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

G. PURVIS.

BLOW-OFF FOR BOILERS.

APPLICATION FILED AUG. 6, 191a.

Patented June 2, 1914.

'3 SHEETS-SHEET 2.

000000000 000000000 .i 000000000m 000000000W 000000000 000000000 000000000 000000000 eory efurvzi,

G. PURVIS.

BLOW-OFF FOR BOILERS.

APPLICATION FILED AUG. e, 1913.

Patented June 2, 19M

3 SHEETS-SHEBT 3.

l/minnow George fa 77/226,

GEORGE PURVIS, 015 DETROIT, MICHIGAN.

BLOW-OFF FOR BOILERS.

Specification of Letters Patent.

Patented June 2, 1914.

Application filed August 6, 1913. Serial No. 783,249.

To all whom it may concern Be it known that I, GEORGE PURVIS, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Blow-Ofis for Boilers, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a blow-off for boilers whereby the sediment that frequently collects at the bottom of the shell may be removed at will of the operator without disturbing the working conditions of the boiler. The invention also includes means for increasing the circulation of the boiler.

The invention consists in the matters hereinafter set forth and particularly pointed out in the appended claims.

In the drawings, Figure 1 is a view in longitudinal vertical section of one type of boiler equipped with a blow-ft that embodies features of the invention; Fig. 2 is a view in transverse section thereof; Fig. is a plan View in detail of the blow-off and adjacent portions of the boiler; Fig. i is a view in detail of the front end of a valve casing; Fig. is a view in transverse section through a valve casing; Fig. 6 is a view in longitudinal section through the casing; Flg. 7 is a view in detail of a suction nozzle; and Figs. 8 and 9 are views in detail of an outlet member of a circulating pipe.

Referring to the drawings, a shell 1 of a boiler, which as herein indicated is of the Scotch type, has a longitudinal member 2 near its base which may be either a stay rod as herein shown or a guide that is inserted for this special purpose. A valve stem 3 extends through a suitable stufling box 4 in parallel relation to the stay rod or guide member 2 and enters through a packing gland 5 into a valve casing (3. The latter is connected to an outlet pipe 7 through the drum of the boiler by means of suitable fittings 8 arranged with telescoping, swiveling, or like flexible connections which permit movement of the casing in the general direction of the guide member 2. A plurality of suction pipes extends from suitable ports 9 in the casing with suction nozzles 10 at their outer ends. The pipes are so disposed that the nozzles are arranged at intervals along the lower portion of the boiler, those that are farthest from the valve casing being supported by hangers 11 with guide wheels 12 that run on the stay or guide member 2. Each suction nozzle preferably consists of a substantially rectangular casing having an open bottom with serrated margins to its walls as indicated at 13, which conform in a general way to the curvature of the boiler shell and act as agitators to stir up any sediment that is collected there.

A disk 14- on the stem 3 within the valve casing is provided with a single port 15 which may be brought into register with any one of the ports 9 that opens into the discharge nozzle pipes by rotating the stem through suitable means as for example, a hand Wheel 17 which may have suitable index means for indicating which suction pipe is open. A suitably disposed spring member 18 may be used to hold the closure to seat.

A circulating pipe 19 having a downturned end portion that opens near the lower portion of the boiler shell discharges through an inlet opening 20 in the casing that is controlled by the closure 1% through a regulating port 21. An upright pipe 22 in the circulating system of the device leads from a second opening 23 in the casing that iscontrolled by a second port 24 in the closure so that it is opened simultaneously with the opening 20 through the port 21 at a time when the ports 9 are sealed by the closure. A suitable fitting 25 is secured on the upper end of the upright pipe 22 and is arranged to increase the circulating effect by bringing as much an area of the discharge member into contact with the hot water at this point as may conveniently be done. Preferably the fitting consists of a nipple 26 discharging through the arm 27 of the spider into the annular space formed by an inner cylinder 28 and an outer cylinder 29 which are substantially continuations of the inner and outer walls respectively of the spider arms. This form of fitting allows the walls to contact inside and out with the hot water at this point and thereby increases the draft through the pipe 22.

In operation, the blow-oil" suction nozzles are opened successively by proper manipulation of the valve stem and closure and during the use of each, the valve stem is reciprocated so that the entire surface of the boiler that may be traversed by each nozzle is thoroughly swept thereby and the sediment stirred up and drawn into the nozzles. Because of the selective action of the valve, one nozzle only at a time is in use and this insures a proper exhaust and consequent velocity through the discharge pipe to produce the necessary results. As an adjunct to the proper operation of the blow-0E the circulating pipes aid in preventing any still pockets in the water and are in action whenever the blow-oft nozzles are closed.

It is understood that the disposition of the several parts is varied to suit the requirements of any type of boiler to which the device may be adjusted and that the manner of suspension of the nozzles may be arranged to utilize any parts of the boiler that could possibly be used for this purpose.

Obviously, changes in the details of construction may be made without departing from the spirit of my invention and I do not care to limit myself to any particular form or arrangement of parts.

hat I claim is 1. A blow off for a boiler having a set of suction members each arranged to sweep a portion of the interior of the boiler she-ll, an extensible outlet pipe through the boiler shell, a valve for selectively throwing the suction members into communication with the outlet pipe, and means exterior to the boiler for mani ulating the valves and suction members.

2. A blow oti for a boiler having a set of suction members, nozzles on the members arranged to sweep and mechanically dislodge matter trom a portion of the interior of the boiler shell, an extensible outlet pipe, a valve for selectively throwing the suction mentbers into communication with the outlet pipe, and means exterior to the boiler for manipulating the valves and suction members.

3. A blow 05 for a boiler having a set of suction members, the nozzles of which are arranged to sweep a portion of the interior of the boiler shell, means for supporting the suction members on a member of the boiler substantially parallel to the path of motion of the members, an outlet pipe through the boiler shell that is longitudinally extensible within the shell, a valve for selectively throwing each of the suction members into communication with the outlet pipe, and means exterior to the boiler for operating the valve and moving the suction members.

4. The combination with a boiler, of a blow off having a set of suction members, the nozzles of which are arranged to sweep a portion of the interior of the boiler shell, an outlet pipe through the shell longitudinally extensible within the shell, a valve having a single outlet in communication with the outlet pipe, and inlets each in communication with the suction member, water circulating means having an inlet adjacent the portion of the boiler shell aitected by the suction members that is controlled by the valve, and means exterior to the casing for operating the valve to cut cit the circulating member and simultaneously throw any one of the suction members into communication with the outlet pipe.

5. A blow off for a boiler comprising a valve having a single outlet and a plurality of inlets, suction members each connected to an inlet of the valve whereby each may be thrown into communication severally with the outlet, means exterior to the boiler for manipulating the valve and reciprocating the same within the boiler, and an outlet pipe through the boiler shell having extensible connections with the outlet of the valve.

6. A blow oflf for a. boiler comprising a valve having a single outlet and a plurality of inlets, suction members each connected to an inlet or" the valve whereby each may be thrown in communication severally with the outlet, means exterior to the boiler for manipulating the valve and reciprocating the same within the boiler, an outlet pipe through the boiler shell having extensible connections with the outlet of the valve, and nozzles on the suction members adapted to mechanically agitate matter on the interior of the shell when the valve is reciprocated.

7. A blow ofi for a boiler comprising a valve having a single outlet and a plurality of inlets, suction members each connected to an inlet of the valve whereby each may be thrown in communication severally with the outlet, means exterior to the boiler for manipulating the valve and reciprocating the same within the boiler, an outlet pipe through the boiler shell having extensible connections with the outlet of the valve, nozzles on the suction members adapted to mechanically agitate matter on the interior of the shell when the valve is reciprocated, and guide hangers for the nozzles reciprocable on a suitable element of the boiler.

8. A blow or for a boiler comprising a valve casing within the boiler shell having a plurality of inlets and an outlet, suction pipes each in communication with an inlet of the casing, a closure in the casing adapted to selectively throw any one of the inlets into communication with the outlet, a valve stem rotatable and reciprocable through the boiler wall for reciprocating the casing and moving the closure, and an outlet pipe through the boiler shell having extensible connections with the outlet of the valve casing.

9. The combination with a boiler, of a blow-oft comprising a valve casing having a plurality of suction inlets and a suction outlet, a circulating inlet and a circulating outlet, suction pipes each leading from a suction inlet, suction nozzles on the pipes adjacent the interior face of the boiler shell, a circulating pipe having an intake end adjacent the boiler shell and leading into the circulating inlet of the casing, an upright circulating pipe leading from the circulating outlet of the casing to the upper portion of the boiler, a single closure adapted to selectively throw each suction inlet into communication with the suction outlet and to open communication between the circulating inlet and the circulating outlet only when the suction inlets are closed, a valve stem reciprocable and rotatable through the boiler shell for operating the valve closure and reciprocating the valve casing, an out let pipe through the boiler shell and on tensible connections between the outlet pipe and the suction outlet oi the casing.

10. The combination with a boiler, of a blow-off comprising a valve casing having a plurality of suction inlets and a suction outlet, a circulating inlet and a circulating outlet, suction pipes each leading from a suction inlet, suction nozzles on the pipes adjacent the interior face of the boiler shell, a circulating pipe having an intake end adjacent the boiler shell and leading into the circulating inlet of the casing, an upright circulating pipe leading from the circulating outlet of the casing to the upper portion of the boiler, a single closure adapted to selectively throw each suction inlet into communication with the suction outlet and to open communication between the circulating inlet and the circulating outlet only when the suction inlets are closed, a valve stem reciprocable and rotatable through the boiler shell for operating the valve closure and reciprocating the valve casing, an outlet pipe through the boiler shell, extensible connections through the outlet pipe and the suction outlet of the casing, and a fitting on the outlet end of the upright circulating pipe having a comparatively large area adapted to contact with the water of the boiler,

11. The combination with a boiler, of a blow-oil comprising a valve casing having a plurality of suction inlets and a suction outlet, a circulating inlet and a circulating outlet, suction pipes each leading from a suction inlet, suction nozzles on the pipes adjacent the interior face of the boiler shell, a circulating pipe having an intake end adjacent the boiler shell and leading into the circulating inlet of the casing, an upright circulating pipe leading from the circulating outlet oi the casing to the upper portion of the boiler, a single closure adapted to selectively throw each suction inlet into communication with the suction outlet and to open communication between the circulating inlet and the circulating outlet only when the suction inlets are closed, a valve stem reciprocable and rotatable through the boiler shell for operating the valve closure and reciprocating the valve casing, an outlet pipe through the boiler shell, extensible connections through the outlet pipe and the suction outlet of the casing, and a fitting consisting of a spider with hollow arms socured on the outlet end of the upright circulating pipe, and a pair of concentric shells forming continuations of the spider arm walls.

12. The combination with a boiler, of a blow off consisting of a valve casing having suction inlets and a suction outlet, a closure for the casing adapted by rotation to throw any one of the inlets into communication with the outlet, a valve stem reciprocable and rotatable through the wall of the boiler for operating the closure and shifting the casing along the shell, suction pipes extending from the suction inlets of the casing, suction nozzles on the pipes each having an opening on its lower side surrounded by serrated margins for agitating sediment on the boiler shell, an outlet pipe through the boiler shell. and extensible connections between the suction pipe and the suction outlet of the casing.

13. A blow oil for a boiler comprising a valve casing having suction inlets and a suction outlet, a closure for the casing adapted by rotation to throw any one of the inlets into communication with the outlet, a valve stem reciprocable and rotatable through the wall of the shell for operating the closure and shifting the casing along the boiler shell, suction pipes extending from the suction inlets of the casing, suction nozzles on the pipes each having an opening on its lower side surrounded by serrated margins for agitating sediment on the boiler shell, an outlet pipe through the boiler shell, extensible connections between the suction pipe and the suction outlet of the casing, a guide member in the boiler par allel to the path of motion of the casing, and hangers tor the nozzles reciprocable on the guide member.

1a. The combination with a boiler, of a blow-olt consisting of a valve casing having suction inlets and a. suction outlet, a closure for the casing adapted by rotation to throw any one of the inlets into communication with the outlet, a valve stem reciprocable and rotatable through the wall of the ca ing for operating the closure and shifting the casing along the shell, suction pipes eX- tending from the suction inlets of the casing, suction nozzles on the pipes each having an opening on its lower side surrounded by serrated margins lfor agitating sediment on the boiler shell, an outlet pipe through the boiler shell, extensible connections between the suction pipe and the suction outlet of the casin g, a c' "culating intake pipe extending from a circulating inlet in the valve casing, and a circulating pipe extending upwardly from a circulating outlet in the valve casing, the

valve closure being adapted to throw the circulating inlet into communication with the circulating outlet only when the suction inlets are each closed.

15. The combination with a boiler, and a guide member along the shell thereof within the boiler, of a valve casing in the shell having a series of suction inlets and a suction outlet, a valve closure in the casing adapted to throw each of the inlets into communication with the suction outlet, a set of suction pipes extending for various distances each from an inlet of the casing, a suction nozzle on each pipe, hangers for the nozzles traveling on the guide member, a valve stem reciprocable and rotatable through the boiler shell for operating the closure and reciprocating the casing, a cir culating inlet pipe carried by the casing, a. circulating outlet pipe carried by the casing, the closure being adapted to throw said circulating pipe into communication when the suction inlets are all closed, said casing and pipes comprising a unitary structure bodily reciprocable within the boiler shell by means of the closure stem from a point without the shell, a suction outlet pipe through the shell, and flexible connections between the outlet pipe and the suction outlet of the casing.

In testimony whereof I affix my signature in presence of two witnesses,

GEORGE PURVIS. Witnesses C. R. STICKNEY, ANNA M. Donn.

Copies of this patent may be obtained for five cents each, by addressing'the "Commissioner of Patents,

Washington, D. G. i .7 

